angel wing begonia
I just purchased a Sophia angel wing begonia. It's quite small and I'd like to set it outdoors till late Sept. Can I put lobelia in the pot with it for the summer or does it like to be alone?
Plants can be put together into containers only when they share the same basic needs -- light, water, and soil. Here are two articles on these plants: https://www.gardeningknowhow.com/ornamental/flowers/begonia/angel-wing-begonia-care.htm
From these you see that while they like basically the same light, lobelia likes to be kept moist, while begonia needs to dry between waterings. These two would probably not be happy together.